A steel beam, bearing the signatures of hundreds of workers and President Barack Obama, is in place on the 104th floor of One World Trade Center, Tuesday, Dec. 11, 2012 in New York. A

 

              A steel beam, bearing the signatures of hundreds of workers and President Barack Obama, is in place on the 104th floor of One World Trade Center, Tuesday, Dec. 11, 2012 in New York.  A
A steel beam, bearing the signatures of hundreds of workers and President Barack Obama, is in place on the 104th floor of One World Trade Center, Tuesday, Dec. 11, 2012 in New York. A 408-foot spire is expected to rise on top of the tower by spring. (AP Photo/Mark Lennihan)